A nitrogen fixing microbe associated with Azolla in rice fields is
(a) Spirulina 
(b) Anabaena
(c) Frankia
(d) Tolypothrix

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The function of leghaemoglobin in the root nodules of legumes is 

(1) oxygen removal

(2) nodule differentiation

(3) expression of nif gene

(4) inhibition of nitrogenase activity

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Nitrifying bacteria

(a) convert free nitrogen to nitrogen compounds
(b) convert proteins into ammonia
(c) reduce nitrates to free nitrogen
(d) oxidize ammonia to nitrates

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An organism used as a biofertilizer for raising soyabean crop is

(a) Azospirillum

(b) Rhizobium

(c) Nostoc

(d) Azotobacter

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An element playing important role in nitrogen fixation is

(a) molybdenum

(b) copper

(c) manganese

(d) zinc

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Which one of the following is not a micronutrient?

(a) Molybdenum

(b) Magnesium

(c) Zinc

(d) Boron

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The free-living, anaerobic nitrogen-fixer is

(a) Beijerinckia

(b) Rhodospirillum

(c) Rhizobium

(d) Azotobacter

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The common nitrogen-fixer in paddy fields is

(a) Rhizobium

(b) Azospirillum

(c) Oscillatoria

(d) Frankia

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Which of the folowing is a symbiotic nitrogen fixer?
(a) Glomus
(b) Azotobacter
(c) Frankia
(d) Azolla

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About 98 percent of the mass of every living organism is composed of just six elements including carbon, hydrogen, nitrogen, oxygen and:
(a) phosphorus and sulphur
(b) sulphur and magnesium
(c) magnesium and sodium
(d) calcium and phosphorus

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